Sketching Trigonometric Curves: Tips and Tricks

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In summary, to sketch the curve y = sin4xcosx on the interval [0, pi/2], you can use the graph of y = sinx as a reference and note that the graph of y = sin4xcosx will not extend below the x-axis. Additionally, graphing y = cosx on the same graph and taking the product of the two functions will result in a reasonably accurate graph.
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zeion
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Homework Statement



I need to sketch this curve from [0, pi/2]

y = sin4xcosx

Homework Equations


The Attempt at a Solution



I tried to generate this thing on a graphing program to see how it looked like.. otherwise I would have no idea what this is.

Is there some easy tips to use to sketch these weird curves? Like by the derivative or something funky?
 
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  • #2
Sketch y = sinx.
Sketch y = sin4x. It's graph will be similar to the graph of y = sinx, except that no part of the graph of y = sin4x extends below the x-axis.

On the same graph as y = sin4x, graph y = cosx. The graph of y = sin4x*cosx will be the product of the two functions. Where one function's value is zero, the product of the two will be zero. Doing this, you should get a reasonably accurate graph.
 

FAQ: Sketching Trigonometric Curves: Tips and Tricks

What is the purpose of sketching a nutty curve?

The purpose of sketching a nutty curve is to visually represent a mathematical function or equation. It can help in understanding the behavior of the curve, identifying key points, and making predictions about its behavior.

What are the steps involved in sketching a nutty curve?

The first step is to determine the domain and range of the function. Then, plot the key points such as the x- and y-intercepts, critical points, and inflection points. Next, sketch the basic shape of the curve by connecting the points. Finally, add in any additional features such as asymptotes or symmetry.

How do I identify the key points on a nutty curve?

To identify key points on a nutty curve, you can set the derivative of the function equal to zero and solve for the x-values. These will be the critical points. The x- and y-intercepts can also be found by setting the corresponding variable equal to zero. Inflection points can be found by setting the second derivative equal to zero.

What are some common mistakes to avoid when sketching a nutty curve?

Some common mistakes to avoid when sketching a nutty curve include not accurately plotting the key points, misinterpreting the behavior of the curve, and not considering the domain and range of the function. It is also important to double-check your calculations and to use a ruler or graphing software for accuracy.

Can sketching a nutty curve help in real-world applications?

Yes, sketching a nutty curve can be useful in real-world applications. It can help in predicting the behavior of a system or process based on mathematical models. For example, it can be used in economics to understand the relationship between variables, in physics to analyze the motion of objects, and in engineering to design and optimize systems.

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